Commuter rail-Urban/suburban
passenger train service for short-distance travel between a central city and
adjacent suburbs run on tracks of a traditional railroad system. Does not
include heavy- or light-rail transit service.

Heavy rail-High-speed transit rail
operated on rights-of-way that exlcude all other vehicles and pedestrians.

Light rail-Urban transit rail
operated on a reserved right-of-way that may be crossed by roads used by
motor vehicles and pedestrians.

Demand responsive-A
nonfixed-route, nonfixed-schedule form of transportation that operates in
response to calls from passengers or their agents to the transit operator or
dispatcher.

SOURCES: American Public
Transportation Association, Public
Transportation Fact Book 2001, tables 18
and 26, available at http://www.apta.com/stats/fares/faremode.htm, as of
February 2003. Modal definitions—U.S. Department of Transportaton, Bureau of Transportation Statistics, Pocket Guide to Transportation 2003 (Washington, DC: 2003), glossary.